<?php
// requires php5

define('UPLOAD_DIR', 'images/');
$img = $_POST['img'];
$img = str_replace('data:image/png;base64,', '', $img);
$img = str_replace(' ', '+', $img);
$data = base64_decode($img);
$file = UPLOAD_DIR . uniqid() . '.png';
$success = file_put_contents($file, $data);
if($success){
    exit(json_encode(array('code'=>'00','msg'=>'ok')));
}else{
    exit(json_encode(array('code'=>'01','msg'=>'保存失败')));
}
?>